ABB / General Electric THHQL1120AF2 AFCI Miniature Circuit Breaker

The THHQL1120AF2 has a higher interrupting rating of 22kAIC, whereas the standard THQL1120AF2 is rated for 10kAIC. They are physically interchangeable in compatible GE and ABB load centers, but the THHQL version is required when a higher available fault current rating is specified by the electrical design.

A combination arc fault circuit interrupter (AFCI) provides protection against both parallel arcing (line-to-line, line-to-ground, or line-to-neutral) and series arcing (arcing across a break within a single wire). This meets modern NEC requirements for residential living spaces.

This breaker features a pigtail neutral connection. The coiled white pigtail wire must be connected directly to the panel's neutral bus bar to power the breaker's internal AFCI circuitry, while the circuit's load neutral connects directly to the designated terminal on the breaker itself.

This plug-in breaker is designed for use in GE PowerMark Gold load centers, ABB ReliaHome load centers, and GE A-Series panelboards that accept 1-inch THQL-style breakers.

Yes, the THHQL1120AF2 combination AFCI replaces the older THHQL1120AF branch/feeder AFCI breaker. The AF2 combination version upgrades the protection to detect both series and parallel arcs in compliance with updated NEC standards.

A 22kAIC rating is typically required in multi-family dwellings, commercial applications, or homes located very close to a utility transformer where the available fault current exceeds the standard 10kAIC limit.